Patent US4780221A successfully refreshed from Google Patents.
US4780221A
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Method and composition for viscosifying hydrocarbons
Assignee: Halliburton Co
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Filing: 1987-06-15
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Granted: 1988-10-25
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Expires: 2007-06-15
Abstract
Abstract The present invention relates to a method and composition for viscosifying hydrocarbon liquids utilizing a viscosifying agent. The viscosifying agent comprises: (i) a copolymer of N,N-dimethylacrylamide and dimethylaminopropyl methacrylamide, (ii) a monocarboxylic acid and (iii) a selected amine having an ethanolamine structure admixed in a hydrocarbon liquid. The viscosifying agent constituents are admixed with the liquid hydrocarbon in an amount sufficient to effect viscosification of the hydrocarbon.
Inventors
- 👤 Marlin D. Holtmyer
- 👤 Charles V. Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:03
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/64; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
156 words
A method of viscosifying a hydrocarbon liquid to produce a fluid useful for the treatment of subterranean formations which comprises admixing a quantity of a viscosifying agent comprising a copolymer of N,N-dimethylacrylamide and dimethylaminopropylmethacrylamide having a molecular weight of at least about 400,000 and a molar ratio of N,N-dimethylacrylamide to dimethylaminopropylmethacrylamide in said copolymer in the range of from about 20:80 to about 70:30 with a monocarboxylic acid having the general formula R--COOH wherein R is an alkyl or alkenyl radical having 11 to 21 carbons, said monocarboxylic acid being present in an amount sufficient to neutralize said copolymer through ion pair formation and a selected water soluble amine having an ethanolamine structure with a hydrocarbon liquid, said copolymer being present in an amount of at least about 0.25 percent by weight of said hydrocarbon liquid, said amine being present in an amount sufficient in combination with said copolymer and monocarboxylic acid to viscosify said hydrocarbon.
Claim 2
Independent Claim
156 words
A method of viscosifying a hydrocarbon liquid to produce a fluid useful for the treatment of subterranean formations which comprises admixing a quantity of a viscosifying agent comprising a copolymer of N,N-dimethylacrylamide and dimethylaminopropylmethacrylamide having a molecular weight of at least about 400,000 and a molar ratio of N,N-dimethylacrylamide to dimethylaminopropylmethacrylamide in said copolymer in the range of from about 20:80 to about 70:30 with a monocarboxylic acid having the general formula R--COOH wherein R is an alkyl or alkenyl radical having 11 to 21 carbons, said monocarboxylic acid being present in an amount sufficient to neutralize said copolymer through ion pair formation and a selected water soluble amine having an ethanolamine structure with a hydrocarbon liquid, said copolymer being present in an amount of at least about 0.25 percent by weight of said hydrocarbon liquid, said amine being present in an amount sufficient in combination with said copolymer and monocarboxylic acid to viscosify said hydrocarbon.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said monocarboxylic acid comprises at least one member selected from the group consisting of tall oil, oleic acid and lauric acid.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said selected amine comprises at least one member selected from the group consisting of methyldiethanolamine, diethanolamine and triethanolamine.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said viscosifying agent is present in an amount of from about 0.25 to about 6 percent by weight of said hydrocarbon liquid.
Claim 6
Dependent Claim
27 words
The method of claim 1 wherein said copolymer has a molar ration of N,N-dimethylacrylamide to dimethylaminopropyl methacrylamide in the range of from about 1:3 to about 2.3:1.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein said copolymer has a molecular weight in the range of from about 400,00 to five million.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein said monocarboxylic acid is present in an amount of from about 0.5 to about 10 percent by weight of said hydrocarbon liquid.
Claim 9
Dependent Claim
146 words
A composition for viscosifying a hydrocarbon liquid useful in forming fluids useful for the treatment of subterranean formations comprising: a copolymer having the general structure: ##STR3## wherein X and Y represent monomer mole percent and X is in the range of from about 20 to about 70 and Y is in the range of from about 30 to about 80 and X+Y=100 and the copolymer has a molecular weight of at least about 400,00; a monocarboxylic acid or mixture of acids of the general formula: R--COOH wherein R represents an alkyl or alkenyl radical having from 11 to 21 carbon atoms, present in an amount at least sufficient to neutralize said copolymer through ion pair formation; and a selected water soluble amine having an ethanolamine structure present in a an amount sufficient in combination with said copolymer and said monocarboxylic acid to viscosify a liquid hydocarbon.
Claim 10
Dependent Claim
146 words
A composition for viscosifying a hydrocarbon liquid useful in forming fluids useful for the treatment of subterranean formations comprising: a copolymer having the general structure: ##STR3## wherein X and Y represent monomer mole percent and X is in the range of from about 20 to about 70 and Y is in the range of from about 30 to about 80 and X+Y=100 and the copolymer has a molecular weight of at least about 400,00; a monocarboxylic acid or mixture of acids of the general formula: R--COOH wherein R represents an alkyl or alkenyl radical having from 11 to 21 carbon atoms, present in an amount at least sufficient to neutralize said copolymer through ion pair formation; and a selected water soluble amine having an ethanolamine structure present in a an amount sufficient in combination with said copolymer and said monocarboxylic acid to viscosify a liquid hydocarbon.
Claim 11
Dependent Claim
31 words
The composition of claim 8 wherein X is in the range of from about 40 to about 60 and Y is in the range of from about 40 to about 60.
Claim 12
Dependent Claim
27 words
The composition of claim 8 wherein said monocarboxylic acid comprises at least one member selected from the group consisting of oleic acid, lauric acid and tall oil.
Claim 13
Dependent Claim
24 words
The composition of claim 8 wherein said selected amine comprises at least one member selected from the group consisting of diethanolamine, methyldiethanolamine and triethanolamine.
Claim 14
Dependent Claim
38 words
The composition of claim 8 wherein said copolymer is present in an amount sufficient to provide a concentration in a liquid hydrocarbon to be viscosified of from about 0.25 to 6 percent by weight of said liquid hydrocarbon.
Claim 15
Dependent Claim
39 words
The composition of claim 8 wherein said monocarboxylic acid is present in an amount sufficient to provide a concentration in a liquid hydrocarbon to be viscosified of from about 0.5 to 10 percent by weight of said liquid hydrocarbon.
Claim 16
Dependent Claim
39 words
The composition of claim 8 wherein said selected amine is present in an amount sufficient to provide a concentration in a liquid hydrocarbon to be viscosified of from about 1 to 2.5 percent by weight of said liquid hydrocarbon.
References Cited (Backward Citations)
US2734861A
Cited
US2667457A
Cited
US2946748A
Cited
US3284393A
Cited
US3359144A
Cited
US4166723A
Cited
US3624019A
Cited
US3724547A
Cited
US3850586A
Cited
US4012327A
Cited
US4152274A
Cited
US4615393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |